Method of neutralizing acid lyes.



P. G. EKSTRM. METHOD 0F NBUTRLIZING ACID LYBS.

APPLIouIox FILED P2B. 24, 1912.

1,098,561 Patented June 2, 1914.

UNITED STATES vlzfi'fllEN'l OFFICE.

PER GsTA EKs'riiivi, or HAR-Nilis, SWEDEN.

METHOD 0F NEUTRALIZING ACID LYES.

Application filed February 24. 1912. eral No. 679.792-

a citizen ot the Kingdom of Sweden, residinz;l at Harnis, 4Sweden, have'invented a new and useful Improved Method ot Neutralzziiig Acid Lyes, of which the following is a specification. h

I lt is Well known that by boiling cellulose inatters for instance, wood, peat, and the like. with acid liquors a liquor can be obtained which after neut alization with suitable basic agents as for instance linie, anu oxidation by aeratiiig :an be used tor the inani'ltacture ot' alcohol by usual alcoholic fermentation.

This invention relates` to an iniproved meth-od of carrying out the neutralizing and aerating process o-lt such liquors by meansof ".rhich it is possible to treat in an ellective and ranid inanner large quantities ot liquor.

The .ivention consists, chiefly in eti'ectiug a rapid action of the neutralizing agent in such manner that, after introduction of the liquor to be treated and the neutralizing agent into a reservoir, compressed air is blown t'roin below through the liquor in aii upward whirling motion thereby effecting an intimate mixing of the liquor and the neutralizing'agent and accelerating the action of the latter. When. the neutralizing process is completed the air supply is interrupted whereupon 1the solid matters inthe liquor are left to sink toward the bottoni of the reservoir, the clear liquid in the surface layer bcing contiiiuousl)7 drawn oi'l by ineans ot a siplion pipe carried by a float .so as to ac celerate the separation of the neutralizeil liquid from the solid matters contained therein. p l

F or the purpose ot removing the sedi; nient iroin the bottoni of the reserroir, saul sediment consisting` partly ot neutralizing agent that has not been consunied and partly ot unsoluble compounds 'foi-ined during the neutralizing process, I then introduce into the reservoir from below water under pressure in a whirling motion so as to :stir up the sediment in the Water which is ftheii together with the said sediment drawn oil: from the reservoir before the solid iiiatteis have again deposited on the bottoni.

I will now more fully describe the uii'ention when used for neutralizing sultte liquor as a. preparatory step for vthe manufacture of alcohol of such liquor. .i

In the accompanying dra wing l have Specification of Lettersatent.

vlliatented .I uiie 2, 1.914.

kkshown a vertical section of an apparatus 'toi Bc it known that il, PER Gros'ra liliie'iiriopr,

marrying the invention into practice.

`Referring to the drawing, l is a reservoir prorideifl with a supply pipe Q tor the liquor to be treated which l. suppose to be sultite liquor. The neutralizing process is suitably carried out before the liquor drawn oli' trom the boilers has been cooled.I thus t'or instance at a temperature of S30-96 vC. As a new tralizing agent l use in well known manner powdered linie-stone, liznc-niud obtained as a waste product in the sulfate pulp process or other ijfalci'lerous matters said neutralizing agent being introduced into the reservoir troni above. .lnasniuch as it is necessary to treat large Vquantities of liquid, for instance 10G-Q00 cu. in. in each charge. mechanical stirrers for keeping` the linie suspended in the liquid cannot suitably he used. According to the present invention the intimate inixingoi the liquor with neutralizing agent is, therefore, carried out in euch inaiiner that coin pressed air is blown through the liquor in 'the reservoir it'ronibelow in a whirliiigniotion. For that purpose a `supply vpipe elfor compressed air having a valve is connected to a now/.le G disposed at the center ot the hotoni 5cl the reservoir l. The said nozzle 6 is provided with a nuinber of helical partitions Ul.. tor instance rtour. which impart a whirling inotion to a Huid adinitttal there through. rIlle bottoni 5 ot the reservoir l has suitably the shape of an inver-sed cone.

The compressed air introduced into thel reservoir 'l through the nozzle (3 not only actsl as al stirring ineans for. intimately mixing the liquor and the ,neutralizing agent with cach other, but also accelerates the neutralizing process by that its oxygen partly oxidizes and decoinposes a nuniber of organic compounds in the liquor, partly converts sult'urous acid contained in the liquor into sulfuric acid which reacts niore easily with the linie, and calciuinnionosultite into calciuinsulfatc whereby the in'ecipitation thereof is accelerated. Then the neutralizing process is going on, a 'vivid foaming takes place in the liquid caused essentially by the carbon dioxid expelled troni` `the linie-stone by the acids of the liquor. Gare inust tlierei'ore be taken that the reservoir is not. ('fi'niipletely iilled with liquid.

Then the neutralizing process has been completed the valve is closed and the ,solid matters of the liquid are left'to sink to-:the

bottom. Much time hay b e saved by drawf ing olf the clear liquid from the surface layer accordingI as the solid matters sink downward, inasmuch as the liquid in a reservoir containing 100 to 200 cu; m. thereof .will require about three or four hours to be fully clear. For carrying out such drawing off of the clear liquid from the surface layer I use a Siphon pipe l0 which is pivoted' to a pipe 8 in the wall of the reservoir and is carried by a iioat ll. The pipe 8 is outside the reservoir connected to a drawing ott1 pipe 9 provided wlth'a valve or the like 7. The siphon pipe S and the float ll are-arranged in such manner that the mouth of the pipe 8 always is held closely below the surface of thtl liquid. In drawing olf the liquid from the reservoir l, the valve 7. is opened as soon as a clear surface layer has been formed in the reservoir and the drawing otl is then "regulated in such manner that the liquor is drawn olf according as it is cleared. When the drawing ott1 of the liquid is ended, the sediment forms a layer covering the bottom of'the reservoir as is indicated at 17 in the drawing. For removing the said sediment I flush the bottom by waterin a special inanner whereby I avoid the employment of me chaniml stirrers. For that purpose a p ipe ltfor supplying water under pressure ha ving a valve 13 or the like is connected to the vuozzle 6. The pressure of the water 1n the pipe lil may suitably be about to 5 kg. per

sq.. c1n. so as to obtain a great power of the water jets flowing out through the nozzle G. These water jets describe on account of the construction of the nozzle a whirling motion and whirl up the sediment from the bottom ofthe reservoir. When the sediment in this manner has been completely whirled up A40.105'v the water admitted into the reservoir through the bipe lil and the nozzle 6, .T

close the valve 13, and'then the water to-' gether with the sediment contained therein is injunediately drawn ott from the reservoir. For that purpose a drawing off pipe 16 having a Valve 15 or the like is connected' to the nozzle. The sediment drawn off from the reservoir in this manner contains a great percentage of calciummonosultite and may he used in producing calciumbisullte for the sulte pulp process. The removal of the sediment may take place after each neutralizing' operation or after a number of Such processes, when a larger quantity of mud has accumulated in the reservoir.

IThe apparatus used in carrying out the above describedr process does not form an)v part ofthis invention but is more fully described and claimed in my patent application Serial Number 679,793, tiled February 2i, 1912.

, I'Iaving now described my invention, what I claim as new and desire to secure by Iletters Patent is:

In the preliara'tionfotl sultite liquor and other acid liquors obtained in boilingl cellulose-containing materials with acid liquids for the n'ianuiacture of alcohol; the method, which comprises neutralizing a large volume o1 such liquor with a heavy neutralizing mat'erial7 maintainingl such material in suspension by a jet. of compressed air. having an upwardly directed rotary motion through the liquor, thereby imparting 'simultaneously an upward movement 'of the material and a spiral movement toward the sides ot' the body ot' liquor thereby elfecting a reaction between the oxygen of the carrying jet of air and material on the'acid contents of the liquor, the material and air being simultaneously moved through thevbody'of liquor in close contact with one another.'

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribingl witnesses.

PER GOSTA EKSTRM.

lVituesses:

ARVID DELMAR, JOHN DELMAR.

Copies/o1 this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

4 Washington, D. C. 

